I hope you can also understand English as well due to my German is still rough.

The place where you are in the Pyramid has a programming bug, yeah. To avoid it, load a save game before you arrived there or just arrived. Try to do all things, talk to Titipoco twice, grab the rope, tell Titipoco to climb the scaffolding, use the button for the lift, go up to the top, see George and General Raúl scene, pick up the bullets, take the cilinder from the machine and cut the tube to get the oil out,...

Once you have done all and not earlier, Nico can go left to the place where the bad guys are. Talk to the leader and specially about Karzac. As soon as the conversation ends, USE THE TORCH (this is important because if you move Nico to any place on the screen or make another action, the bug will arise). Now Nico has the torch icon and can use it with Titipoco to start the fire throwing the torch into the oil and using the bullets in it.

Yes, I can understand you. I've only needed dictionary for looking up 3 words. My German is getting better .

Well, try this: Load the game just arrived to the pyramid or the the last before the Pyramid. Do everything I told you, but BEFORE you use the elevator, go left, speak with the boss and as I told you USE the torch. Now Nico should has the torch icon active and can use it. As soon as you get this icon active, you can make the rest of things you left. Now you can finally finish the adventure.